Randomized trials (RTs) are used to learn about treatment effects. This paper studies identification of average treatment response (ATR) and average treatment effect (ATE) from RT data under various assumptions. The focus is the problem of external validity of the RT. RT data need not point identify the ATR or ATE because of selective participation in the RT. The paper reports partial identific...

It is simply impossible to know all about the world by one’s own experience. Therefore, the media have an important role to play in informing people about events that occur and the interpretation of these events. However, people do not have to pay attention to this information. There is a significant difference between people’s interest in a topic and following it in the media. Given the import...

The external validity of experiments in economics can be ensured only if participants reflect the relevant market population. We study data from a promotional campaign of NH-Hoteles to study sample selection problems in a gift exchange field experiment. The promotion allowed guests to pay any non-negative amount for a stay in one of 36 hotels in Belgium and the Netherlands. We distinguish betwe...

Little is known regarding the form executive support should take for the progressive use of information technology and information systems [FT] within organisations. This study applies the theory developed by Jarvenpaa and Ives (1991) who examined two forms of support provided by chief executive officers. These were executive participation, a set of IT-related activities, and executive involvem...

This paper finds a significant association between television advertising for financial services brands and consumers’ tendency to search branded keywords (e.g. ―Fidelity‖) rather than generic category-related keywords (e.g. ―stocks‖). The effect is largest for young brands during standard business hours with an elasticity, .07, comparable to extant measurements of advertising’s impact on sales...

M ost coaches and athletes would argue that endurance is a factor that can affect sports performance. However, definitions of endurance vary from sport to sport. For this discussion, endurance is defined as the ability to maintain or repeat a given force or power output. Although explaining the performance–strength relationship in sports is a multi-factorial concept, evidence indicates that max...

Neher et al 2 Summary Typically, measurements that aim to predict perceived spatial impression of music signals in concert halls are performed by calculating the interaural cross-correlation coefficient (IACC) of a binaurally-recorded impulse response. Previous research, however, has shown that this can lead to results very different from those obtained if a musical input signal is used. The re...

A number of empirical studies using students as subjects has been carried out in the last few years. These studies are usually conducted as pilot experiments that allow researchers to fine-tune an experiment before deploying it in an industrial environment. Though one of the issues usually taken into account with these experiments is their external validity, other issues need to be considered, ...